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Buy X Get Y lets you reward one purchase with another product.

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Best Use Cases

  • Classic BOGO campaigns
  • Attach-rate campaigns (buy item A, discount item B)
  • Product-pair promotions (camera + tripod, dress + accessory)

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Common Structures

  • Buy one, get one free
  • Buy X, get Y percent off
  • Buy X, get Y amount off
  • Buy X, get Y at fixed price

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Key Controls

  • X side: what customers must buy to unlock the deal
  • Y side: what item gets discounted
  • Discount mode for Y: free, percent off, amount off, fixed price
  • Optional prorated discount: spread savings across Buy X and Get Y items by price
  • Limits: max discount per order, multiple uses per order

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Example

Buy any sweater, get one scarf free. Sweater unlocks the offer, scarf receives the discount.

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Prorated Discount

Eligible BXGY offers include a Prorated discount option.
  • On: the total savings are shared across both the qualifying and discounted items based on their relative price
  • Off: the full savings stay on the Get Y item
This matters most for:
  • BOGO or free-item offers, where turning prorating on can make the Get Y item no longer appear fully free
  • Fixed-price offers, where the savings created by the fixed price can be spread across both sides of the offer
  • Mixed-price carts, where the discount split changes based on the item prices in the cart
Use prorating when you want the promotion to behave more like a shared bundle savings offer. Leave it off when you want a classic “Get Y free” or “Get Y discounted” presentation.

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Same-Product / Same-Collection Upsell Math

When you set up a Buy X Get Y offer where the Buy X (qualifying) and Get Y (discounted target) items are the same product or are selected from the same pool/collection (e.g., “Buy 3, Get 1 Free” of the same item):
  • Corrected Eligibility Math: The cart upsell progress calculator automatically adjusts to count both the qualifiers and target items. For example, if a shopper has 2 items in the cart for a “Buy 3 Get 1 Free” offer, the inline progress message will correctly prompt them to “Add 2 items more” (3 qualifiers + 1 target = 4 total) to get the free item, rather than misleadingly telling them to “Add 1 more”.
  • Qualifier Reservation: Qualifying items are reserved first for the promotion. The progress message keeps track of how many items are currently acting as qualifiers versus those that have already received the discount.

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